 |
| Titel |
Simultaneous factor analysis of organic particle and gas mass spectra: AMS and PTR-MS measurements at an urban site |
| VerfasserIn |
J. G. Slowik, A. Vlasenko, M. McGuire, G. J. Evans, J. P. D. Abbatt |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 4 ; Nr. 10, no. 4 (2010-02-19), S.1969-1988 |
| Datensatznummer |
250008128
|
| Publikation (Nr.) |
 copernicus.org/acp-10-1969-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| During the winter component of the SPORT (Seasonal Particle
Observations in the Region of Toronto) field campaign, particulate
non-refractory chemical composition and concentration of selected
volatile organic compounds (VOCs) were measured by an Aerodyne
time-of-flight aerosol mass spectrometer (AMS) and a proton transfer
reaction-mass spectrometer (PTR-MS), respectively. Sampling was
performed in downtown Toronto ~15 m from a major road. The
mass spectra from the AMS and PTR-MS were combined into a unified
dataset, which was analysed using positive matrix factorization
(PMF). The two instruments were given balanced weight in the PMF
analysis by the application of a scaling factor to the uncertainties
of each instrument. A residual based metric, Δesc, was used to evaluate the instrument relative weight
within each solution. The PMF analysis yielded a 6-factor solution
that included factors characteristic of regional transport, local
traffic emissions, charbroiling and oxidative processing. The
unified dataset provides information on emission sources (particle
and VOC) and atmospheric processing that cannot be obtained from the
datasets of the individual instruments: (1) apportionment of
oxygenated VOCs to either direct emission sources or secondary
reaction products; (2) improved correlation of oxygenated aerosol
factors with photochemical age; and (3) increased detail regarding
the composition of oxygenated organic aerosol factors. This analysis
represents the first application of PMF to a unified AMS/PTR-MS
dataset. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|